A suicide bomber killed at least 13 people at Shia processions in the Pakistani city of Rawalpindi.
Local television stations said 13 people were killed but police put the death toll at eight. Twenty-five people were injured, including children.
The blast ripped a hole in the walls of a Shia mosque in Rawalpindi, near the capital Islamabad. Body parts were scattered at the scene.
Hundreds of worshippers, beating their heads and chests, kept marching, even though other explosive devices were found at the site.
There was no immediate claim of responsibility for the attack, which occurred hours after two bomb blasts killed at least three people near a gathering of Shia in Pakistan's commercial hub and biggest city, Karachi.